Chemical Engineering Archives

7911. The rate of reaction does not decrease appreciably as the reaction proceeds in case of __________ reactions.

Autocatalytic

Exothermic

Endothermic

Autothermal

✅ The correct answer is option A.

7912. For high conversion in a highly exothermic solid catalysed reaction, use a __________ bed reactor.

Fixed

Fluidised bed reactor followed by a fixed

Fixed bed reactor followed by a fluidised

Fluidised

✅ The correct answer is option B.

7913. The reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction.

Biochemical

Photochemical

Catalytic

Autocatalytic

✅ The correct answer is option D.

7914. B.E.T. method of finding out surface area of a catalyst, uses the extension of __________ isotherm.

Langmuir

Freundlich

Tempkin

None of these

✅ The correct answer is option A.

7915. A pollutant P degrades according to first order kinetics. An aqueous stream containing P at 2 kmole/m³ and volumetric flow rate 1m³ /h requires a mixed flow reactor of volume V to bring down the pollutant level to 0.5 kmole/m³ . The inlet concentration of the pollutant is now doubled and the volumetric flow rate is tripled. If the pollutant level is to be brought down to the same level of 0.5 kmole/m³ , the volume of the mixed flow reactor should be increased by a factor of

7-Mar

✅ The correct answer is option A.

7916. Arrhenious equation represents graphically the variation between the __________ and temperature.

Rate of reaction

Frequency factor

Rate constant

Activation energy

✅ The correct answer is option C.

7917. For a zero order chemical reaction, the

Half life period is directly proportion to the initial concentration of the reac-tants

Plot of products concentration with time is a straight line through the origin

Products concentration increases linerarly with time

All of the above

✅ The correct answer is option D.

7918. Chemical kinetics can predict the __________ of a chemical reaction.

Rate

Feasibility

Both A & B

Neither A nor B

✅ The correct answer is option A.

7919. Which of the following factors control the design of a fluid-solid reactor?

Reaction kinetics for single particle,

Size distribution of solids beingtreated

Flow patterns of solids and fluid in the reactor

All of the above

✅ The correct answer is option D.

7920. Helium-mercury method can be used to determine the __________ of the catalyst particle.

Pore volume

Solid density

Porosity

All of the above

✅ The correct answer is option D.